collections {
   group { name: "test_group";
      parts {
         part { name: "background";
            type: RECT;
            description { state: "default" 0.0;
               color: 33 32 32 255;
               rel1.relative: 0 0;
               rel2.relative: 1 1;
               max: 200 200;
            }
         }
         part { name: "rect";
            type: RECT;
            description { state: "default" 0.0;
               rel1.relative: 0.5 0.5;
               rel2.relative: 0.5 0.5;
               min: 50 50;
               size_class: "rect_size";
            }
         }
      }
   }
}
